Search Health Endpoint

Health endpoint format

{
  "ASFSearchAPI": {
    "ok?": true
  },
  "CMRSearchAPI": {
    "echo": {
      "ok?": true
    },
    "index-set": {
      "dependencies": {
        "echo": {
          "ok?": true
        },
        "elastic_search": {
          "ok?": true
        }
      },
      "ok?": true
    },
    "internal-metadata-db": {
      "dependencies": {
        "echo": {
          "ok?": true
        },
        "oracle": {
          "ok?": true
        }
      },
      "ok?": true
    }
  }
}